You can start by setting the scene. For example, describe the place where you first met your crush, like a sunny beach or a crowded subway. Then introduce your feelings at that moment, whether it was a sudden jolt of excitement or a slow - burning admiration.
If you can't keep it inside, you could start by sharing your feelings in a light - hearted way. For example, say something like 'You know, sometimes I think you'd make an amazing partner in a different kind of way.' This way, it's not too intense, and it gives your best friend a chance to respond without feeling pressured. If they seem open to it, you can gradually be more serious about your feelings.
Approach it slowly. Start with lots of gentle communication, like talking about your feelings and expectations. You could also plan a special, relaxing time when you both feel calm and in the mood.
First, understand the characters well. Know your crush's personality traits, likes, and dislikes. Then, create an interesting plot. It could start with an accidental encounter between the reader and the crush. For example, in a coffee shop where they both reach for the last muffin. Next, develop their relationship gradually. Show how they start to open up to each other, share secrets, and grow closer. Use vivid descriptions to make the story come alive, like describing the blush on the reader's face when the crush says something sweet. Also, add some internal monologue to let the reader know what the characters are thinking. This makes the story more engaging and relatable.